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Part II. Phased Implementation Plan for DMAC4.7.6. Taxonomic information4.7.7. Browsing by thematic areas4.7.8. Iterative/refinement searches4.8. The system must be extensible to support other specific searches as required by the system,such as search by data quality or native format4.9. Select - The Select functionality refers to those capabilities that allow an end user or data providerto examine data sets revealed from the data search and then choose sets of interest fordownloading, on-line browse, or access via the DMAC Data Transport mechanism.4.9.1. There shall be a user interface for allowing the user to select items for downloading. Thiswill be referred to as the selection interface.4.9.2. The selection interface shall display and accept selection requests for all data sets fromthe catalog software that meet the search criteria specified by the user in the search interface.4.9.3. For each data set returned from a search of the catalog, the selection interface shall displaythe data set title and relevant metadata including spatial and temporal coveragesand a method for viewing the metadata from that data set.4.9.4. The selection interface shall provide a graphical means of viewing a thumbnail of eachdata set received from the catalog search.4.9.5. The selection interface shall allow the user the ability to select from the items returnedfrom the search and/or perform subsequent subsetting searches of the returned items.4.10. Data set metadata shall be obtainable in multiple formats including both machine-readableXML and human-readable text.5. Portal5.1. Access to data and metadata shall be provided through the Internet via a portal. A portal is anInternet presence (e.g., web site) that redirects the user (possibly transparently) to a larger setof access points.5.2. It is a system goal that graphical user interfaces (GUIs) shall be simple to use for a broad spectrumof users.5.3. The IOOS portal will consist of an entry point (a Web “home page”), hierarchically lower levelentries (other pages), and links to areas or functions within the IOOS.5.4. There shall be simplified versions of the portal suitable for incorporation into non-IOOS Websites for purposes of offering the capability to search IOOS data.5.5. The portal shall provide mechanisms for accessing web-services enabled functions of theIOOS.5.6. The portal shall conform to all Federal guidelines on Internet presence.5.7. The portal shall be designed to be Section 508 compliant (see http://www.section508.gov/).5.8. The portal shall provide all necessary policy statements and legal disclaimers.61